Population (i) Due to CO2 world emission limit of 2.5 GtC/yr. (ii) At present lifestyle, allowing 12% for biodiversity(iii) At 'Modest' lifestyle, allowing 12% for biodiversity yield factor to allow for sustainability. adjustment to the yield size of the Modest energy footprint (factor). area used for built-up land (gha to subtract). Cropland carrying capacity Grazing carrying capacity Forest carrying capacity